Words that contain 'm' and end in 'ma'

Which word on this page ranks as the most common?
As far as well-known words go, there's 'mamma', which is the 5458^th most common word.

How many characters are in the longest word from this list?
The biggest word one can derive from this list is 'lymphangioendothelioma', which is made up of 22 characters.

What is the highest number of points you could get in Scrabble from this list of words that contain 'm' and end in 'ma'?
With the amount of words to pick from, we'd suggest going for 'myxedema' which scores 23 points overall.

Is there an example word from this page which could be deemed as unusual?
By far the most unusual word from this list is 'stemma'. 'Stemma''s definition is "(a) One of the ocelli of an insect. See Ocellus. (B) One of the facets of a compound eye of any arthropod.", according to the dictionary.

How many viable words could one make with this list?
You can go with up to 288 words.